5-Forces

Question 1

What does vector mean

Answer 1

Magnitude with a direction

Question 2

What does scalar mean

Answer 2

Has magnitude and no direction

Question 3

What are examples of vector quantities

Answer 3

Force, velocity, displacement, acceleration, momentum

Question 4

What are examples of scalar quantities

Answer 4

Speed, distance, mass, temperature,time

Question 5

How r vectors usually represented

Answer 5

By an arrow- the length of the arrow determines the magnitude and the direction of the arrow shows the direction of the quantity

Question 6

What is a force

Answer 6

A push or a pull on an object that is caused by it interacting with something

Question 7

What is a contact force

Answer 7

When objects have to be touching for a force to act

Question 8

What is a non contact force

Answer 8

When the objects do not need to be touching for the force to act

Question 9

What are examples of a contact force

Answer 9

Friction, air resistance, tension in ropes

Question 10

What are examples of non-contact forces

Answer 10

Magnetic force, gravitational force, electrostatic force

Question 11

What is an interaction pair

Answer 11

A pair of forces that are equal and opposite and act in two interacting objects

Question 12

What is gravity

Answer 12

It attracts all masses, but this is only noticed when the mass is really big. eg. a planet

Question 13

What are the effects of gravity

Answer 13

On the surface of a planet, it makes all things fall towards the ground.
It gives everything a weight

Question 14

What is mass

Answer 14

The amount of stuff in an object

Question 15

What is weight

Answer 15

The force acting on an object due to gravity

Question 16

What does the weight of an object depend on

Answer 16

The strength of the gravitational field at the location of the object

Question 17

How is weight measured

Answer 17

A calibrated spring balance (Newtonmeter)

Question 18

What is the equation for weight

Answer 18

Weight (N) = Mass (kg) x Gravitational field strength (N/kg)

Question 19

What is the gravitational field strength of earth

Answer 19

9.8 N/kg

Question 20

What is the gravitational field strength of the moon

Answer 20

Around 1.6 N/Kg

Question 21

What does a free body diagram show

Answer 21

All the forces acting on an object

Question 22

How are the relative magnitudes of the forces shown on a free body diagram

Answer 22

The size of the arrow

Question 23

What is the resultant force

Answer 23

The overall force and direction that acting on an object

Question 24

If a resultant force moves an object through a distance then what happens

Answer 24

Energy is transferred and work is done in the object

Question 25

What is some (waste) energy transferred to when an object is moved along a rough surface

Answer 25

Thermal energy stores

Question 26

What is the unit for work done

Answer 26

Joules

J

Question 27

What is the equation for work done

Answer 27

Work done(J) = Force(N) x Distance(M)

W=Fs

Question 28

What are scale drawings used for

Answer 28

Working out resultant forces

Question 29

How can an object be in equilibrium

Answer 29

The forces acting it are balanced and have a resultant force of 0

Question 30

What is equation for force in terms of spring constant and extension

Answer 30

Force(N) = spring constant(N/m) x Extension(m)

F = ke

Question 31

When does extension and force become not directly proportional

Answer 31

When too much force is applied

Question 32

What is the equation for elastic potential energy

Answer 32

Elastic potential energy(J) = 1/2 x spring constant(N/m) x Extension*2(m)

Ee = 1/2k e*2